Finding the Fourth Proportional to 77,660.50, 116,320.00 and 64,180.72

Step by Step Solution

1. Step 1: Write the proportion equation
   77,660.50 : 116,320.00 = 64,180.72 : x
2. Step 2: Convert to fraction form
   77,660.50/116,320.00 = 64,180.72/x
3. Step 3: Cross multiply
   77,660.50x = 116,320.00 × 64,180.72
4. Step 4: Simplify right side
   77,660.50x = 7,465,500,899.15
5. Step 5: Solve for x
   x = 7,465,500,899.15/77,660.50
6. Step 6: Final answer
   x = 96,129.96